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Created PU-7 diagram (markdown)

kalymos
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## PU-7 PsNee modchip installation diagram
The PU-7 was the very first PlayStation 1 board that was released. It is found on all Japanese SCPH-1000’s, along with some SCPH-1001’s, SCPH-1002’s, SCPH-3000’s, and SCPH-3500’s.
This board is unique because it has the pins for S-Video video output along with the RCA video output ports. The S-Video port was only available on the Japanese SCPH-1000, but the pins are still
on other systems with the PU-7 board.
![PU-7](https://github.com/kalymos/PsNee/blob/master/images/motherboard/PU-7.png)
### About the points
For models SCPH-xxx1, SCPH-xxx2, all the points are
on the back, and you can ignore the RESET. On the
other hand, the model and SCPH_xxx0, you will have
to use the RESET point, and the BIOS points.
![BIOS 32p SCPH 1000-3000](https://github.com/kalymos/PsNee/blob/master/images/BIOS/32p%20SCPH%201000-3000-pic.png)
![BIOS 40p SCPH 1000-3000](https://github.com/kalymos/PsNee/blob/master/images/BIOS/40p%20SCPH%201000-3000-pic.png)
### Installation tips
Here are some tips I have for you when you are
soldering your chip into the PU-7.
* Cut your wires to be as short and direct as
possible.
* You don’t need to connect pins one and two of
the ATtinyX5 chip. Just desolder the wire.
* Use a multimeter to probe around for alternative
VCC and GND points closer to where you
position your chip for a cleaner installation.
* Try to position your chip towards the middle of
where all the wires need to go, to minimize wire
length.